Greenstone, Banded Iron Formation, and stromatolite fossils, Lake Michigans Left Coast, by Elizabeth Fagan

Greenstone, Banded Iron Formation, and Stromatolite Fossils

In its earliest youth, our planet was molten, red-hot, and battered by abundant meteorites. Earth was so hostile to life that scientists named this period the Hadean Eon (4.6–4 billion years ago), for Hades, the Greek god of the place known as Hell. Life began to evolve after Earth settled down a bit, in the … Continue reading Greenstone, Banded Iron Formation, and Stromatolite Fossils

Basalt with feldspar, Lake Michigans Left Coast, a blog by Elizabeth Fagan

Basalt with Feldspar Porphyry

Porphyry an igneous rock characterized by larger crystals embedded in a fine-grained mass. These are feldspar-basalt porphyry, with feldspar crystals in basalt. Repeated glacial episodes brought all kinds of rocks to my Lake Michigan beach in Ozaukee County, Wisconsin, like these, which originated in the Canadian Shield. Copyright, Disclaimer, Bibliography Elizabeth Fagan, Elizabeth Fagan, Elizabeth … Continue reading Basalt with Feldspar Porphyry